Thought I'd throw one more trick at you, that might work for you at Irvine.
Often this time of Year at Castiac stripers suspend down between forty and sixty feet. I've tried downrigging for them but have had better success using heavy jigs.
Take a heavy ball jig in a 4 to 6 to 8 ounce size.
You run ten inches of line up to t3way swivel and feet feet of line back to a small lure like a floating rapala. For stripers I like to use a BBZ shad behind it but the idea is to use a light weight lure that stays up high with lots of action. Drop it down and troll with it just like your fishing a downrigger.
Never taken trout with it but I have caught stripers, and my take is the jig just adds fish attraction unlike a dowregger ball or plain weight.
Jim